Danemayer you didn't understand the post. The gas leak was on a faulty hose at the space heater had nothing to do with the refrigerator. As far as the new ignitor installation, there is a gas safety shut off mechanism on the refrigerator. That could of failed???? Although since no one from Dometic or Heartland was willing to investigate the cause, who knows?
Just saying, if someone works on the propane side of the refrigerator, and subsequently there's a fire at the refrigerator, those 2 events might be connected. For example, if the tech disconnected the propane line, perhaps to check pressure, he could have left behind a slow leak after he was done.
Something else to consider. I've read most every post on this forum for about 11 years. I don't remember other propane side failures where the igniter was the problem. Not saying it can't happen. But it's not common. More typical problems are with propane supply, thermistor, and control board. So I have to wonder what the tech might have done before concluding the igniter had failed. The corrective action makes me wonder about the tech.
Also, when running the fridge on propane, there's an open flame. If there was a propane leak, the flame could extend back from the igniter area to the source of the leak and then quickly spread to surrounding materials. But once the surrounding materials caught fire, I'd have expected the whole trailer to be totally engulfed in 3-4 minutes. So maybe that's not the cause.
On the other hand, if an insect/wasp nest/leaves was the source of the fire, perhaps the heat from the cooling unit, or perhaps contact with the open flame, caused charring and some smoke but there wasn't enough combustible material to set surrounding materials fully on fire. From the pictures, it's hard to tell what burned or how much. But obviously the trailer didn't burn to the ground.
Regardless of cause, this is the type of problem that the National Highway Transportation Safety Administration (NHTSA) may be interested in investigating. If you think a Dometic defect, or a Heartland installation defect led to this fire, you should file a report on their website.